fix(billing): ensure all tenants have valid Stripe customer IDs

backend/migrations/0001_init.sql

@@ -12,7 +12,7 @@ CREATE TABLE IF NOT EXISTS tenant (
   nwc_url TEXT NOT NULL DEFAULT '',
   nwc_error TEXT,
   created_at INTEGER NOT NULL,
-  stripe_customer_id TEXT NOT NULL DEFAULT '',
+  stripe_customer_id TEXT NOT NULL,
   stripe_subscription_id TEXT,
   past_due_at INTEGER
 );

backend/src/api.rs

@@ -370,32 +370,50 @@ async fn get_identity(
     let pubkey = state.api.extract_auth_pubkey(&headers)?;
     let is_admin = state.api.admins.iter().any(|a| a == &pubkey);
 
-    // Only create if tenant doesn't exist yet
-    if let Ok(None) = state.api.query.get_tenant(&pubkey).await {
-        // TODO: Call Stripe API to create a new customer
-        let stripe_customer_id = String::new();
+    // Ensure tenant exists.
+    match state.api.query.get_tenant(&pubkey).await {
+        Ok(Some(_)) => {}
+        Ok(None) => {
+            let stripe_customer_id = match state.api.billing.stripe_create_customer(&pubkey).await {
+                Ok(id) => id,
+                Err(e) => {
+                    return Ok(err(
+                        StatusCode::INTERNAL_SERVER_ERROR,
+                        "stripe-customer-create-failed",
+                        &e.to_string(),
+                    ));
+                }
+            };
 
-        let tenant = Tenant {
-            pubkey: pubkey.clone(),
-            nwc_url: String::new(),
-            nwc_error: None,
-            created_at: now_ts(),
-            stripe_customer_id,
-            stripe_subscription_id: None,
-            past_due_at: None,
-        };
+            let tenant = Tenant {
+                pubkey: pubkey.clone(),
+                nwc_url: String::new(),
+                nwc_error: None,
+                created_at: now_ts(),
+                stripe_customer_id,
+                stripe_subscription_id: None,
+                past_due_at: None,
+            };
 
-        match state.api.command.create_tenant(&tenant).await {
-            Ok(()) => {}
-            Err(e) if matches!(map_unique_error(&e), Some("pubkey-exists")) => {}
-            Err(e) => {
-                return Ok(err(
-                    StatusCode::INTERNAL_SERVER_ERROR,
-                    "internal",
-                    &e.to_string(),
-                ));
-            }
-        };
+            match state.api.command.create_tenant(&tenant).await {
+                Ok(()) => {}
+                Err(e) if matches!(map_unique_error(&e), Some("pubkey-exists")) => {}
+                Err(e) => {
+                    return Ok(err(
+                        StatusCode::INTERNAL_SERVER_ERROR,
+                        "internal",
+                        &e.to_string(),
+                    ));
+                }
+            };
+        }
+        Err(e) => {
+            return Ok(err(
+                StatusCode::INTERNAL_SERVER_ERROR,
+                "internal",
+                &e.to_string(),
+            ));
+        }
     }
 
     Ok(ok(StatusCode::OK, IdentityResponse { pubkey, is_admin }))

backend/src/billing.rs

@@ -56,6 +56,9 @@ impl Billing {
     pub fn new(query: Query, command: Command, robot: Robot) -> Self {
         let nwc_url = std::env::var("NWC_URL").unwrap_or_default();
         let stripe_secret_key = std::env::var("STRIPE_SECRET_KEY").unwrap_or_default();
+        if stripe_secret_key.trim().is_empty() {
+            panic!("missing STRIPE_SECRET_KEY environment variable");
+        }
         let stripe_webhook_secret = std::env::var("STRIPE_WEBHOOK_SECRET").unwrap_or_default();
         let btc_quote_api_base =
             std::env::var("BTC_PRICE_API_BASE").unwrap_or_else(|_| COINBASE_SPOT_API.to_string());
@@ -472,6 +475,33 @@ impl Billing {
         Ok((invoice, tenant))
     }
 
+    pub async fn stripe_create_customer(&self, tenant_pubkey: &str) -> Result<String> {
+        let short_pubkey: String = tenant_pubkey.chars().take(12).collect();
+        let display_name = format!("Caravel tenant {short_pubkey}");
+
+        let resp = self
+            .http
+            .post(format!("{STRIPE_API}/customers"))
+            .bearer_auth(&self.stripe_secret_key)
+            .form(&[
+                ("name", display_name.as_str()),
+                ("metadata[tenant_pubkey]", tenant_pubkey),
+            ])
+            .send()
+            .await?;
+
+        let body: serde_json::Value = resp.error_for_status()?.json().await?;
+        let customer_id = body["id"]
+            .as_str()
+            .ok_or_else(|| anyhow!("missing customer id"))?;
+
+        if !customer_id.starts_with("cus_") {
+            return Err(anyhow!("unexpected customer id format"));
+        }
+
+        Ok(customer_id.to_string())
+    }
+
     pub async fn stripe_list_invoices(&self, customer_id: &str) -> Result<serde_json::Value> {
         let resp = self
             .http

backend/src/command.rs

@@ -66,6 +66,10 @@ impl Command {
     }
 
     pub async fn create_tenant(&self, tenant: &Tenant) -> Result<()> {
+        if tenant.stripe_customer_id.trim().is_empty() {
+            anyhow::bail!("stripe_customer_id is required");
+        }
+
         let mut tx = self.pool.begin().await?;
 
         sqlx::query(
@@ -205,7 +209,8 @@ impl Command {
             .execute(&mut *tx)
             .await?;
 
-        let activity = Self::insert_activity(&mut tx, activity_type, "relay", relay_id).await?;
+        let activity =
+            Self::insert_activity(&mut tx, "deactivate_relay", "relay", &relay_id).await?;
 
         tx.commit().await?;
         self.emit(activity);